An injection needle with adjustable needle pitch

Abstract

A kind of injection needle with adjustable needle spacing, comprising needle tube arranged on needle seat, and knob nested in the outer wall of needle tube, shunt plate is arranged on the needle seat, and a plurality of shunt holes for communicating with main flow channel are arranged on the shunt plate;Each outer wall of the needle tube is independently fixedly connected with a sliding block;The knob is sleeved on the outer periphery of guide block;The guide block is provided with guide block sliding groove consistent with the number of needle tube.In the present application, the dynamic adjustment function of needle spacing makes the injection needle can adapt to various types of medicaments, solves the problem that the fixed needle spacing design in the prior art cannot meet the different medicament diffusion characteristics.By adjusting the needle spacing according to the viscosity of medicament, the problems of overlapping injection caused by large diffusion range of thin medicament and insufficient coverage caused by small diffusion range of dense medicament are effectively avoided, so as to optimize the treatment effect and improve the safety.

Description

Technical Field

[0001] This invention relates to the field of microneedle injection needles, and particularly to an injection needle with adjustable needle spacing. Background Technology

[0002] Microneedling, also known as hyaluronic acid injection, is a common skin cosmetic treatment product used for facial injection of hyaluronic acid to provide hydration, moisturization, and improve skin quality.

[0003] Most existing microneedle injection needles use a fixed needle spacing design. However, the fixed needle spacing is not adjustable, and the diffusion range of drugs with different viscosities varies greatly. When the diffusion range of thin drugs is large, the fixed needle spacing leads to overlapping injections, resulting in over-injection, adverse reactions, or waste. When the diffusion range of thick drugs is small, the fixed needle spacing provides insufficient coverage, and the effect is not up to standard. At the same time, the fixed needle has poor versatility; the same needle cannot be used for multiple types of injectable drugs, requiring frequent needle changes.

[0004] Therefore, the existing technology has problems and needs further improvement and development. Summary of the Invention

[0005] (I) Purpose of the invention: In order to solve the problems existing in the prior art, the purpose of the present invention is to provide an injection needle with adjustable needle spacing, which adapts to the diffusion characteristics of drugs with different viscosity by dynamically adjusting the needle spacing, avoiding over-injection or insufficient coverage, and improving the versatility and safety of the injection needle.

[0006] (II) Technical Solution: To solve the above-mentioned technical problems, this technical solution provides an injection needle with adjustable needle spacing, including a needle tube disposed on a needle hub and a knob nested on the outer wall of the needle tube. A flow divider is disposed on the needle hub, and the flow divider is provided with multiple flow divider holes communicating with the main flow channel. A slider is independently fixedly connected to the outer wall of each needle tube. The knob is sleeved on the outer periphery of a guide block. The guide block is provided with guide block grooves consistent with the number of needle tubes.

[0007] The knob is provided with an adjustment groove, and the slider is fitted into the adjustment groove and the guide block groove. The adjustment groove drives the slider to move along the guide block groove, thereby driving the needle tube to move synchronously in a centripetal or centrifugal motion to adjust the needle distance.

[0008] Furthermore, the number of needles is ≥2.

[0009] Furthermore, the slider includes a front cylinder, a middle square cylinder, and a rear cylinder; the front cylinder is cylindrical and located at the front end of the slider; the rear cylinder is cylindrical and located at the rear end of the slider; the middle square cylinder is a flat rectangular parallelepiped and located in the middle of the front and rear cylinders; the axes of the front cylinder, middle square cylinder, and rear cylinder of each slider coincide with the axis of the corresponding needle tube.

[0010] Furthermore, the knob is located at the front end of the slider and is a cylindrical structure with openings at both ends and a horizontal plate in the middle. An adjustment groove is provided on the horizontal plate of the knob, and the number of adjustment grooves is the same as the number of needle tubes.

[0011] Furthermore, the front and rear ends of the adjustable groove pass through the horizontal plate, and the adjustable groove is distributed in a spiral pattern on the horizontal plate with the center point of the spiral located on the axis of the knob.

[0012] Furthermore, the center of the knob's horizontal plate is a hollow circular hole; a cylindrical protrusion is provided at the center of the front end of the guide block, the cylindrical protrusion is inserted into the hollow circular hole at the center of the knob's horizontal plate, the cylindrical protrusion is used to fix the guide block to the knob, and the outer diameter of the cylindrical protrusion is equal to the diameter of the hollow circular hole at the center of the knob's horizontal plate.

[0013] Furthermore, the guide block is located between the slider and the diverter plate, and has a disc-shaped structure. The knob is sleeved on the outer periphery of the guide block, and a sealing ring is provided between the knob and the guide block for sealing.

[0014] Furthermore, the guide block is provided with guide block grooves that are the same number as the number of needle tubes. The guide block grooves extend radially, and the front and rear ends of the guide block grooves pass through the guide block.

[0015] Furthermore, the front end face of the guide block is provided with a raised limiting groove. The limiting groove is in the shape of a hollow arrow, with the arrow pointing towards the axis of the guide block. The arrow between the two limiting grooves provides a limit for the slider of the inner ring, and the hollow arrow body of the limiting groove provides a limit for the slider of the outer ring.

[0016] Furthermore, the front cylindrical part of the slider is fitted into the adjustable groove, the rear cylindrical part of the slider is fitted into the guide block groove, and the middle square column of the slider is limited within the limiting groove of the guide block.

[0017] (III) Beneficial Effects: The dynamic adjustment function of the needle spacing in this invention allows the injection needle to adapt to various types of drugs, solving the problem that the fixed needle spacing design in the prior art cannot meet the diffusion characteristics of different drugs. By adjusting the needle spacing according to the drug viscosity, the problem of overlapping injection caused by the large diffusion range of thin drugs and the problem of insufficient coverage caused by the small diffusion range of dense drugs are effectively avoided, thereby optimizing the treatment effect and improving safety. The intuitive knob adjustment and scale marking design allow users to quickly set the needle spacing, making the operation convenient and precise. Attached Figure Description

[0018] Figure 1 This is an assembly diagram of the needle tube and the slider in this invention;

[0019] Figure 2 This is a diagram showing the assembly relationship between the slider and the guide block groove in this invention.

[0020] Figure 3 This is a cross-sectional view of the injection needle in this invention;

[0021] Figure 4 This is a schematic diagram illustrating the clockwise adjustment principle of the needle spacing in this invention.

[0022] Figure 5 This is a schematic diagram illustrating the counterclockwise adjustment principle of the needle spacing in this invention.

[0023] Figure 6 This is a schematic diagram of the guide block structure in this invention;

[0024] Figure 7 This is an exploded view of the injection needle in this invention.

[0025] Reference numerals in the attached diagram: 1. Needle seat; 2. Diverter plate; 3. Needle tube; 4. Guide block; 5. Sealing ring; 6. Slider; 7. Knob; 8. Sheath; 401. Guide block groove; 701. Adjustment groove. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to preferred embodiments. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0027] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that these drawings are for illustrative purposes only and are not drawn to scale, and should not be construed as limiting the actual scope of protection of the present invention.

[0028] An adjustable needle pitch injection needle includes a needle tube 3 mounted on a needle holder 1 and a knob 7 nested on the outer wall of the needle tube 3. A flow divider 2 is mounted on the needle holder 1, and the flow divider 2 has multiple flow divider holes communicating with the main flow channel. A slider 6 is independently fixedly connected to the outer wall of each needle tube 3. The knob 7 is sleeved on the outer periphery of a guide block 4. The guide block 4 has guide block grooves 401 in number consistent with the number of needle tubes 3.

[0029] The knob 7 is provided with an adjustment groove 701. The slider 6 is fitted into the adjustment groove 701 and the guide block groove 401. The adjustment groove 701 drives the slider 6 to move along the guide block groove 401, thereby driving the needle tube 3 to move synchronously in a centripetal or centrifugal motion to adjust the needle distance.

[0030] In this design, the central axis of the needle holder 1 is used as the reference axis. Along the reference axis, the end closer to the syringe is the rear end, and the end closer to the needle tip of the needle tube 3 is the front end. The radial direction is perpendicular to the reference axis, and the circumferential direction is the direction of rotation around the reference axis. The axes of the flow divider 2, the knob 7, and the guide block 4 coincide with the reference axis.

[0031] Specifically, such as Figure 1-7 As shown, the needle hub 1 has a Luer interface at its rear end for connecting a syringe; the flow divider 2 is fixed inside the front end of the needle hub 1, and the flow divider 2 has a main channel and a flow divider hole. The main channel is connected to the Luer interface, and the flow divider hole is connected to the main channel; the rear end of the needle tube 3 is connected to the flow divider hole one by one; the number of needle tubes 3 is ≥2; each needle tube 3 has an independently fixed slider 6 on its outer wall; the knob 7 is sleeved on the outer periphery of the guide block 4 and is coaxially arranged with the flow divider 2; the front end of the knob 7 is threadedly connected to the rear end of the sheath 8, and the sheath 8 rotates synchronously with the knob 7; the guide block 4 has a guide block groove 401 with the same number of needle tubes 3, and the guide block groove 401 extends radially.

[0032] The knob 7 is provided with an adjustment groove 701. The front end of the slider 6 is fitted into the adjustment groove 701, and the rear end of the slider 6 is fitted into the guide block groove 401. When the knob 7 is rotated, the adjustment groove 701 drives the slider 6 to move radially along the guide block groove 401, thereby driving the needle tube 3 to move synchronously in a centripetal or centrifugal motion to adjust the needle spacing.

[0033] The needle hub 1 is a cylindrical hollow structure with a Luer interface at the rear end, which is matched with the syringe. The front end of the needle hub 1 is open, and the needle hub 1 has an annular step inside for positioning the flow divider 2.

[0034] The structure and shape of the flow divider 2 match the arrangement of the needle tubes 3. A main channel communicating with the needle holder 1 is opened at the center of the rear end of the flow divider 2. The front end of the flow divider 2 has the same number of diversion holes as the needle tubes 3, and the diameter of the diversion holes matches the outer diameter of the needle tubes 3. The main channel of the flow divider 2 communicates with the diversion holes for the flow of medication. The flow divider 2 and the needle holder 1 are engaged or bonded by an annular step inside the needle holder 1 to ensure no medication leakage at the front and rear ends of the flow divider 2.

[0035] The front end of the needle tube 3 is a beveled needle tip, and the rear end is a flat straight end. Preferably, the needle tube 3 is a stainless steel capillary tube. The rear end of the needle tube 3 is inserted into the diversion hole of the diversion plate 2 to a depth of 1-2 mm, and is fixed by laser welding. The weld point is located at the junction of the front end face of the diversion plate 2 and the outer wall of the needle tube 3, forming an annular seal. Preferably, the needle tubes 3 are arranged in a circular array.

[0036] like Figure 1 As shown, each needle tube 3 is independently and fixedly connected to a slider 6 on its outer wall. The slider 6 includes a front cylinder, a middle square column, and a rear cylinder. The front cylinder is cylindrical and located at the front end of the slider 6; the rear cylinder is cylindrical and located at the rear end of the slider 6; the middle square column is a flat rectangular parallelepiped located between the front and rear cylinders. The axes of the front cylinder, middle square column, and rear cylinder of each slider 6 coincide with the axis of the corresponding needle tube 3.

[0037] The knob 7 is located at the front end of the slider 6 and is a cylindrical structure with open ends and a horizontal plate in the middle. Its vertical cross-section is H-shaped. The outer wall of the knob 7 has protruding posts, which provide a force application point when the knob 7 rotates. Adjustment grooves 701 are provided on the horizontal plate of the knob 7. The number of adjustment grooves 701 is the same as the number of needle tubes 3. The front and rear ends of the adjustment grooves 701 penetrate the horizontal plate, and the adjustment grooves 701 are distributed in a spiral pattern on the horizontal plate with the center point of the spiral located on the axis of the knob 7. The center of the horizontal plate of the knob 7 is a hollow circular hole.

[0038] like Figure 6As shown, the guide block 4 is located between the slider 6 and the diverter plate 2, and has a disc-shaped structure. The knob 7 is sleeved on the outer periphery of the guide block 4, and a sealing ring 5 is provided between the knob 7 and the guide block 4 for sealing. The guide block 4 has guide block grooves 401 in the same number as the needle tubes 3. The guide block grooves 401 extend radially, and the front and rear ends of the guide block grooves 401 pass through the guide block 4. The front end face of the guide block 4 also has a raised limiting groove. The limiting groove is hollow arrow-shaped, with the arrow pointing towards the axis of the guide block 4. The outer walls of the arrows of the two limiting grooves provide a limit for the inner ring slider 6, and the hollow arrow body of the limiting groove provides a limit for the outer ring slider 6. A cylindrical protrusion is provided at the center of the front end of the guide block 4. The cylindrical protrusion is inserted into the hollow circular hole at the center of the horizontal plate of the knob 7 to fix the guide block 4 to the knob 7. The outer diameter of the cylindrical protrusion is equal to the diameter of the hollow circular hole at the center of the horizontal plate of the knob 7. A guide block 4 connecting arm is fixedly provided at the rear end of the guide block 4. The guide block 4 connecting arm is fastened to the needle seat 1 to fix the guide block 4 to the needle seat 1.

[0039] The front cylindrical part of the slider 6 is fitted into the adjusting groove 701, the rear cylindrical part of the slider 6 is fitted into the guide block groove 401, and the middle square column of the slider 6 is limited within the limiting groove of the guide block 4. Figure 4 , 5 As shown, when the knob 7 is rotated, the pitch adjustment groove 701 drives the slider 6 to move radially along the guide block groove 401, causing the needle tube 3 to move synchronously in a centripetal or centrifugal motion to adjust the needle spacing. When injecting a diluted drug, rotating the knob 7 clockwise causes the needle tube 3 to move circumferentially away from the reference axis, increasing the needle spacing. When injecting a viscous drug, rotating the knob 7 counterclockwise causes the needle tube 3 to move circumferentially closer to the reference axis, decreasing the needle spacing.

[0040] The sheath 8 is a cylindrical structure open at both ends. The front end of the knob 7 is connected to the rear end of the sheath 8 by a thread, and the sheath 8 rotates synchronously with the knob 7. A negative pressure chamber is formed between the front end of the sheath 8 and the skin to adhere to the skin. Preferably, the length of the needle tip protruding from the front end of the sheath 8 is 0.5~2.5mm.

[0041] The present invention provides a preferred embodiment in which, based on the original solution, a scale mark is added to the needle holder 1 to correspond to different needle spacing adjustment levels, thereby improving the needle spacing adjustment accuracy and facilitating quantitative adjustment of the needle spacing.

[0042] This invention also provides a preferred embodiment, which adds a viscosity monitoring module to the original solution, specifically including a miniature pressure sensor, a miniature flow sensor, and an external display screen. The miniature pressure sensor and miniature flow sensor are installed in the flow divider holes of the flow divider plate 2 to monitor the pressure and flow rate of the drug in the syringe 3 in real time. The external display screen is electrically connected to the miniature pressure sensor and miniature flow sensor via wires to display the pressure and flow rate of the drug in the syringe 3 in real time and calculate the viscosity of the drug, providing real-time data for adjusting the needle spacing. Specifically, before injection, when the drug flows through the flow divider plate 2, the sensors detect the pressure and flow rate data in real time. The external display screen calculates and displays the drug pressure, flow rate, and viscosity based on a preset algorithm according to the correspondence between viscosity and pressure / flow rate, providing the operator with a quantitative basis for needle spacing adjustment, such as displaying: recommended needle spacing 6mm. By adding miniature sensors and an external display screen, this invention provides real-time quantitative data for needle spacing adjustment, further improving the adjustment accuracy.

[0043] The present invention also provides a preferred embodiment, which, based on the original scheme, includes two sets of adjustable grooves 701 with different helix angles on the inner wall of the knob 7. The inner helix angle is smaller than the outer helix angle, and the adjustable grooves 701 are concentrically distributed along the central axis of the knob 7. An outer ring stepped damping protrusion is provided on the inner side wall of the hollow arrow body of the limiting groove of the guide block 4. The closer the outer ring stepped damping protrusion is to the reference axis in the radial direction, the higher its protrusion height, used to adjust the sliding resistance of the outer ring slider 6 within the limiting groove. An inner ring stepped damping protrusion is also provided on the outer wall of the arrow in the limiting groove. The farther the inner ring stepped damping protrusion is from the reference axis in the radial direction, the higher its protrusion height, used to adjust the sliding resistance of the inner ring slider 6 between the limiting grooves. When knob 7 is rotated clockwise, the outer ring slider 6 slides radially away from the reference axis within the hollow arrow body of the limiting groove. The resistance of the outer ring stepped damping protrusions to the outer ring slider 6 gradually decreases, and the sliding speed of the outer ring slider 6 increases. Conversely, when knob 7 is rotated counterclockwise, the outer ring slider 6 slides radially towards the reference axis within the hollow arrow body of the limiting groove. The resistance of the outer ring stepped damping protrusions to the outer ring slider 6 gradually increases, and the sliding speed of the outer ring slider 6 decreases. This embodiment can form a ring-shaped non-uniform needle spacing distribution with a "sparse periphery and dense center," supporting dynamic adjustment of the inner and outer ring needle tubes 3, and adapting to the needs of injecting large-area, thin medications or localized specific areas. The height of the outer ring stepped damping protrusion and the inner ring stepped damping protrusion are set according to specific needs, and no specific limitations are imposed here.

[0044] Working principle: The needle spacing is preset according to the viscosity of the medication. Rotating the knob clockwise or counterclockwise causes the adjustment groove to rotate synchronously. The inner wall of the adjustment groove presses against the slider, generating radial driving force. The slider is constrained by the guide block groove and can only move along its radial path, unable to rotate circumferentially with the knob. The slider drives the needle to move radially synchronously. When the knob is rotated clockwise, the needle moves away from the center, increasing the needle spacing; when the knob is rotated counterclockwise, the needle moves closer to the center, decreasing the needle spacing. After the needle spacing is adjusted, a negative pressure chamber is used to absorb the skin, the syringe pushes the medication, and the needle is removed after injection.

[0045] The adjustable-spacing injection needle of this invention can be used in various skin cosmetic treatment scenarios. For example, when injecting facial hyaluronic acid, a thinner drug with a larger diffusion range, the user can increase the needle spacing by rotating the knob to avoid over-injection or adverse reactions caused by overlapping injections. Conversely, for denser drugs, such as whitening injections, with a smaller diffusion range, the user can decrease the needle spacing to expand the coverage area, thereby ensuring the treatment effect is achieved. By dynamically adjusting the needle spacing, the injection needle can adapt to various drug types, significantly reducing the frequency of needle replacements and lowering operational complexity and usage costs.

[0046] The dynamic needle spacing adjustment function of this invention allows the injection needle to adapt to various drug types, solving the problem that the fixed needle spacing design in the prior art cannot meet the diffusion characteristics of different drugs. By adjusting the needle spacing according to the drug viscosity, it effectively avoids the problem of overlapping injection caused by the large diffusion range of thin drugs, and the problem of insufficient coverage caused by the small diffusion range of dense drugs, thereby optimizing the treatment effect and improving safety. The intuitive knob adjustment and scale marking design allow users to quickly set the needle spacing, making the operation convenient and precise. In addition, by adding a micro sensor and an external display screen, this invention provides real-time quantitative data for needle spacing adjustment, further improving the adjustment accuracy.

[0047] The above description illustrates preferred embodiments of the present invention and helps those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative and should not be construed as limiting the specific implementation of the present invention to these embodiments. For those skilled in the art, several simple deductions and modifications can be made without departing from the inventive concept, and all such modifications should be considered within the protection scope of the present invention.

Claims

1. An injection needle with adjustable needle spacing, comprising a needle tube disposed on a needle hub, and a knob nested in the outer wall of the needle tube, characterized in that, A flow divider plate is provided on the needle hub, and the flow divider plate has multiple flow divider holes communicating with the main flow channel; a slider is independently fixed to the outer wall of each needle tube; the knob is sleeved on the outer periphery of the guide block; the guide block has guide block grooves consistent with the number of needle tubes. The knob is provided with an adjustment groove, and the slider is fitted into the adjustment groove and the guide block groove. The adjustment groove drives the slider to move along the guide block groove, thereby driving the needle tube to move synchronously in a centripetal or centrifugal motion to adjust the needle distance. The slider includes a front cylinder, a middle square cylinder, and a rear cylinder; the front cylinder is located at the front end of the slider; the rear cylinder is located at the rear end of the slider; the middle square cylinder is located in the middle part between the front cylinder and the rear cylinder; the axis of the front cylinder, middle square cylinder, and rear cylinder of each slider coincides with the axis of the corresponding needle tube. The front cylindrical part of the slider is fitted into the adjustable groove, the rear cylindrical part of the slider is fitted into the guide block groove, and the middle square column of the slider is limited within the limiting groove of the guide block.

2. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The number of needles is ≥2.

3. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The knob is located at the front end of the slider and is a cylindrical structure with openings at both ends and a horizontal plate in the middle. An adjustment groove is provided on the horizontal plate of the knob, and the number of adjustment grooves is the same as the number of needle tubes.

4. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The front and rear ends of the adjustable slide groove pass through the horizontal plate, and the adjustable slide groove is distributed in a spiral pattern on the horizontal plate with the center point of the spiral located on the axis of the knob.

5. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The center of the knob's horizontal plate is a hollow circular hole; a cylindrical protrusion is provided at the center of the front end of the guide block, and the cylindrical protrusion is inserted into the hollow circular hole at the center of the knob's horizontal plate. The cylindrical protrusion is used to fix the guide block to the knob, and the outer diameter of the cylindrical protrusion is equal to the diameter of the hollow circular hole at the center of the knob's horizontal plate.

6. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The guide block is located between the slider and the diverter plate and has a disc-shaped structure. The knob is sleeved on the outer periphery of the guide block, and a sealing ring is provided between the knob and the guide block for sealing.

7. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The guide block is provided with guide block grooves that are the same number as the number of needles. The guide block grooves extend radially and the front and rear ends of the guide block grooves pass through the guide block.

8. The injection needle with adjustable needle spacing according to claim 1, characterized in that, The front end face of the guide block is also provided with a raised limiting groove. The limiting groove is in the shape of a hollow arrow, with the arrow pointing towards the axis of the guide block. The arrow between the two limiting grooves provides a limit for the slider of the inner ring, and the hollow arrow body of the limiting groove provides a limit for the slider of the outer ring.

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